Significant Accounting Policies - Net Income (Loss) Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 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 (in shares)	23,975	21,764	23,974	21,787
Incremental shares issuable upon the assumed exercise of stock options (in shares)	5	16	6	19
Unvested restricted stock and restricted stock units (in shares)	146	232	159	235
Shares used to compute diluted earnings per share (in shares)	24,126	22,012	24,139	22,041
Anti-dilutive shares excluded from the diluted earnings per share calculation (in shares)	385	0	252	2