UNAUDITED QUARTERLY DATA - Summary of Impact on Operating Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended												6 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue	$ 38,225	$ 37,646	$ 34,406	$ 33,522	$ 42,125	$ 33,592	$ 31,532	$ 25,259	$ 31,779	$ 26,301	$ 21,787	$ 21,569	$ 56,791	$ 43,356	$ 90,383	$ 69,657	$ 143,799	$ 132,508	$ 101,436
Costs of sales						23,747	22,360	19,078	25,802	19,959	15,342	15,272	41,438	30,614	65,185	50,573	105,680	96,832	76,375
Gross profit	8,987	9,779	9,243	10,110	10,478	9,845	9,172	6,181	5,977	6,342	6,445	6,297	15,353	12,742	25,198	19,084	38,119	35,676	25,061
Operating (loss) income	$ (10,143)	$ (3,892)	$ (10,200)	$ (5,921)	$ (1,002)	(2,566)	(3,905)	(1,750)	(2,401)	(459)	109	(1,383)	(5,655)	(1,274)	(8,221)	(1,733)	(30,156)	(9,223)	(4,134)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest						(3,203)	(4,351)	(2,143)	(2,912)	(902)	(209)	(3,347)	(6,494)	(3,556)	(9,697)	(4,458)	$ (31,766)	$ (11,385)	(7,370)
Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue						(2,240)	(974)	(358)	(2,510)	(159)	31	(19)	(1,332)	12	(3,572)	(147)			(2,657)
Costs of sales						(141)	(945)	662	(967)	124	(80)	(149)	(283)	(229)	(424)	(105)			(1,072)
Gross profit						(2,099)	(29)	(1,020)	(1,543)	(283)	111	130	(1,049)	241	(3,148)	(42)			(1,585)
Operating (loss) income						(2,066)	(705)	(1,198)	(2,833)	(878)	(125)	(433)	(1,903)	(558)	(3,969)	(1,436)			(4,269)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest						(2,225)	(908)	(1,462)	(3,148)	(1,247)	(442)	(768)	(2,370)	(1,210)	(4,595)	(2,457)			(5,605)
Adjustments | Audit Committee Investigation-related Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue						(768)	(866)	(411)	(2,457)	(111)	0	0	(1,277)	0	(2,045)	(111)			(2,568)
Costs of sales						(293)	(1,225)	165	(1,139)	(24)	0	0	(1,060)	0	(1,353)	(24)			(1,163)
Gross profit						(475)	359	(576)	(1,318)	(87)	0	0	(217)	0	(692)	(87)			(1,405)
Operating (loss) income						(9)	359	(576)	(1,318)	(87)	0	0	(217)	0	(226)	(87)			(1,405)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest						(29)	357	(576)	(1,318)	(87)	0	0	(219)	0	(248)	(87)			(1,405)
Adjustments | Acquisition and Financial Integration-related Adjustments
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue						(1,546)	(60)	0					(60)		(1,606)
Costs of sales						(79)	(33)	0					(33)		(112)
Gross profit						(1,467)	(27)	0					(27)		(1,494)
Operating (loss) income						(1,594)	(288)	0					(288)		(1,882)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest						(1,499)	(223)	0					(223)		(1,722)
Adjustments | Significant Account and Transaction Review and Other
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue						75	(47)	53	(53)	(49)	31	(18)	6	13	81	(36)			(89)
Costs of sales						231	313	497	173	147	(81)	(148)	810	(229)	1,041	(82)			91
Gross profit						(156)	(360)	(444)	(226)	(196)	112	130	(804)	242	(960)	46			(180)
Operating (loss) income						(461)	(775)	(622)	(1,516)	(790)	(124)	(434)	(1,397)	(558)	(1,858)	(1,348)			(2,864)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest						$ (696)	$ (1,041)	$ (886)	$ (1,831)	$ (1,159)	$ (441)	$ (769)	$ (1,927)	$ (1,210)	$ (2,623)	$ (2,369)			$ (4,200)