Significant Accounting Policies - Net Income (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Schedule of reconciliation of shares used to calculate basic and diluted earnings per share
Weighted average shares outstanding used to compute basic earnings per share	23,974	21,810
Incremental shares issuable upon the assumed exercise of stock options	7	21
Unvested restricted stock and restricted stock units	172	240
Shares used to compute diluted earnings per share	24,153	22,071
Anti-dilutive shares excluded from the diluted earnings per share calculation	118	3