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stock period Common Stock, Terms of Conversion, Period Common Stock, Terms of Conversion, Period Other non-current liabilities Other Liabilities, Noncurrent Class A and Class B Common Stock Common Class A And Common Class B [Member] Common Class A And Common Class B Proceeds from exercise of stock options Proceeds from Stock Options Exercised Gross profit Segment Gross Profit Gross Profit Estimate of potential damages and attorney fees Loss Contingency, Damages Sought, Value Loss Per Share Earnings Per Share [Text Block] Other income, net: Other Nonoperating Income (Expense) [Abstract] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Class of Stock [Domain] Class of Stock [Domain] Basic loss per share: Earnings Per Share Reconciliation [Abstract] Number of warrants issued (in shares) Class of Warrant or Right, Outstanding Other current liabilities Other Liabilities, Current Maximum Maximum [Member] Title of 12(b) Security Title of 12(b) Security