Stockholders' Equity - Basic and Diluted Net Income (Loss) Per Common Shares (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss)	$ 3,165	$ 3,759	$ (4,540)	$ (1,326)	$ (670)	$ 741	$ 2,384	$ (1,255)
Denominator:
Basic and diluted weighted average outstanding shares of common stock (in shares)	19,051,502			19,086,811			19,008,969	19,166,812
Diluted weighted average outstanding shares of common stock (in shares)	19,208,452			19,086,811			19,273,243	19,166,812
Basic net income (loss) per common share (usd per share)	$ 0.17			$ (0.07)			$ 0.13	$ (0.07)
Diluted net income (loss) per common share (usd per share)	$ 0.16			$ (0.07)			$ 0.12	$ (0.07)