Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total Revenue	$ 106,868	$ 104,672	$ 101,713	$ 95,577	$ 76,475	$ 69,097	$ 67,746	$ 63,423	$ 408,830	$ 276,741	$ 240,251
Gross Profit	49,923	50,832	48,966	47,115	37,111	32,321	30,530	27,303	196,836	127,265	101,956
Net income (loss)	6,296	2,143	1,991	(2,424)	353	2,023	(380)	644	8,006	2,640	(396)
Deemed dividends on preferred stock and amortization of preferred stock beneficial conversion feature and gain on redemption of preferred stock					0	0	(6,304)	2,856		(3,448)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 6,296	$ 2,143	$ 1,991	$ (2,424)	$ 353	$ 2,023	$ 5,924	$ (2,212)	$ 8,006	$ 6,088	$ (10,943)
Earnings Per Share, Basic and Diluted [Abstract]
Basic (in dollars per share)	$ 0.06	$ 0.02	$ 0.02	$ (0.03)	$ 0	$ 0.02	$ 0.07	$ (0.03)	$ 0.08	$ 0.07	$ (0.14)
Diluted (in dollars per share)	$ 0.06	$ 0.02	$ 0.02	$ (0.03)	$ 0	$ 0.02	$ 0.07	$ (0.03)	$ 0.08	$ 0.07	$ (0.14)
Basic weighted average common shares outstanding	104,393	103,899	98,297	94,740	93,270	87,253	81,017	80,507	100,470	85,618	79,426
Diluted (in dollars per share)	107,816	107,880	102,336	94,740	96,874	90,899	90,168	80,507	103,615	91,568	79,426