Net Income Per Common Share - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Income Per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net income		$ 1,645	$ 7,164
Basic:
Weighted average shares of common stock and vested, undelivered restricted stock units outstanding		28,757,259	29,708,233
Diluted:
Weighted average shares of common stock and vested, undelivered restricted stock units outstanding		28,757,259	29,708,233
Effect of potentially dilutive shares	[1]	195,847	4,706,024
Total weighted average shares of common stock and vested, undelivered restricted stock units outstanding and potentially dilutive shares		28,953,106	34,414,257
Basic:
Net income applicable to common stockholders		$ 1,645	$ 7,164
Weighted average shares of stock outstanding		28,757,259	29,708,233
Basic net income per common share		$ 0.06	$ 0.24
Diluted:
Net income applicable to common stockholders		$ 1,645	$ 7,804
Weighted average shares of stock outstanding		28,953,106	34,414,257
Diluted net income per common share	[1]	$ 0.06	$ 0.23

[1] In calculating diluted net income per share, 1.3 million shares and 78 thousand shares related to outstanding stock options and unvested, undelivered restricted stock units were excluded for the three months ended March 31, 2023 and 2022, respectively. Additionally, for the three months ended March 31, 2023, the interest expense and amortization of note costs relating to the shares issuable upon conversion of our outstanding convertible notes were excluded from the calculation as they would have been anti-dilutive. For the three months ended March 31, 2022, in calculating diluted net income per share, we excluded the impact of interest expense and amortization of note costs relating to the shares issuable upon conversion of our outstanding convertible notes from net income and included the weighted average shares under the if-converted method. For each of the three months ended March 31, 2023, and 2022 interest expense including amortization of note issuance costs, related to convertible notes was $0.6 million. For each of the three months ended March 31, 2023, and 2022 the weighted average shares under the if-converted method for our convertible bond was 3.9 million shares.