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Common Stock Conditional Capital Other income, net Other Nonoperating Income (Expense) Other Nonoperating Income (Expense), Total Increase (Decrease) in Contract with Customer, Liability Deferred revenue Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements - Recently Adopted Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Total unrecognized compensation expense related to stock options Estimated gross proceeds from issuance of common stock. Estimated Gross Proceeds From Issuance Of Common Stock Aggregate estimated gross proceeds Marketable Securities, Current, Total Marketable Securities, Current Marketable securities Fair Value, Recurring [Member] Recurring Basis [Member] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Other Assets, Noncurrent, Total Other Assets, Noncurrent Other non-current assets OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax, Total OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax Unrealized loss, net Employee Stock [Member] ESPP [Member] Collaborative Arrangement and Arrangement Other than Collaborative [Axis] Collaborative Arrangement and Arrangement Other than Collaborative Accrued property and equipment. Accrued Property And Equipment Accrued property and equipment Prepaid Expenses and Other Current Assets [Member] Sale of Stock [Axis] Sale of Stock Treasury shares, at cost, 180,316 shares at March 31, 2022 and at December 31, 2021 Treasury Stock, Value, Ending Balance Treasury Stock, Value, Beginning Balance Treasury Stock, Value, Total Treasury Stock, Value Fair Value Disclosures [Text Block] Fair Value Measurements Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Total unrecognized compensation expense Proceeds from Issuance of Common Stock Proceeds from issuance of common shares, net of issuance costs Proceeds from issuance of common shares