Stockholders' Equity - Basic and Diluted Net Income (Loss) Per Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net (loss) income	$ 3,759	$ (4,539)	$ (670)	$ 742	$ (780)	$ 72
Denominator:
Basic and diluted weighted average outstanding shares of common stock (in shares)	19,016,853		19,217,866		18,987,469	19,207,476
Diluted weighted average outstanding shares of common stock (in shares)	19,115,148		19,217,866		18,987,469	19,375,599
Basic and diluted net (loss) income per common share (usd per share)	$ 0.20		$ (0.03)		$ (0.04)	$ 0