RESTATEMENT AND REVISION OF PRIOR PERIOD FINANCIAL STATEMENTS Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018
Current assets:
Cash and cash equivalents	$ 25,540	$ 27,464	$ 32,788	$ 63,193	$ 68,262
Accounts receivable, less allowance	18,728	21,906	20,473	10,088	18,882
Finance receivables, net	7,445	6,727	6,541	5,972	5,480
Inventory, net	9,469	11,273	11,488	7,343	6,915
Prepaid expenses and other current assets	1,808	1,558	2,878	2,871	1,463
Total current assets	62,990	68,928	74,168	89,467	101,002
Non-current assets:
Finance receivables due after one year, net	12,379	12,642	12,342	12,838	13,629
Other assets	2,015	2,099	1,922	1,903	1,900
Property and equipment, net	9,122	9,590	9,422	9,736	9,855
Operating lease right-of-use assets	6,514
Intangibles, net	25,387	26,171	26,956	27,740	28,533
Goodwill	63,945	63,945	63,945	63,945	63,945
Total non-current assets	119,362	114,447	114,587	116,162	117,862
Total assets	182,352	183,375	188,755	205,629	218,864
Current liabilities:
Accounts payable	28,555	27,584	26,088	17,570	19,335
Accrued expenses	29,140	23,351	19,974	21,150	21,848
Capital lease obligations and current obligations under long-term debt	10,826	12,497	13,202	33,235	33,889
Income taxes payable	252	254	42	25	11
Deferred revenue	1,649	1,681	1,498	1,613	1,604
Total current liabilities	70,422	65,367	60,804	73,593	76,687
Long-term liabilities:
Deferred income taxes	76	71	81	76	71
Debt and other financing arrangements, noncurrent	184	276	512	632	932
Accrued expenses, less current portion	0	100	100	101	66
Operating lease liabilities, non-current	5,327
Total long-term liabilities	5,587	447	693	809	1,069
Total liabilities	76,009	65,814	61,497	74,402	77,756
Series A convertible preferred stock	3,138	3,138	3,138	3,138	3,138
Shareholders’ equity:
Preferred stock	0	0	0	0	0
Common stock	377,143	376,853	376,700	376,363	375,806
Accumulated deficit	(273,938)	(262,430)	(252,580)	(248,274)	(237,836)
Total shareholders’ equity	103,205	114,423	124,120	128,089	137,970	$ 142,688
Total liabilities, convertible preferred stock and shareholders’ equity	182,352	183,375	188,755	205,629	218,864
As Previously Reported
Current assets:
Cash and cash equivalents	25,540	27,464	32,788	63,193	68,262
Accounts receivable, less allowance	17,120	21,712	20,492	10,132	18,921
Finance receivables, net	7,216	6,260	6,119	5,591	5,141
Inventory, net	9,344	10,908	11,488	7,343	6,915
Prepaid expenses and other current assets	1,808	1,558	2,878	2,871	1,463
Total current assets	61,028	67,902	73,765	89,130	100,702
Non-current assets:
Finance receivables due after one year, net	12,710	11,596	11,362	11,910	12,770
Other assets	1,811	2,099	1,922	1,903	1,900
Property and equipment, net	7,697	9,180	9,116	9,546	9,778
Operating lease right-of-use assets	6,514
Intangibles, net	25,387	26,171	26,956	27,740	28,533
Goodwill	64,149	64,149	64,149	64,149	64,149
Total non-current assets	118,268	113,195	113,505	115,248	117,130
Total assets	179,296	181,097	187,270	204,378	217,832
Current liabilities:
Accounts payable	27,453	27,511	26,058	17,570	19,335
Accrued expenses	29,245	23,258	19,974	21,150	21,848
Capital lease obligations and current obligations under long-term debt	10,826	12,497	13,202	33,235	33,889
Income taxes payable	252	254	42	25	11
Deferred revenue	2,949	1,539	1,322	1,437	1,428
Total current liabilities	70,725	65,059	60,598	73,417	76,511
Long-term liabilities:
Deferred income taxes	76	71	81	76	71
Debt and other financing arrangements, noncurrent	184	276	512	632	932
Accrued expenses, less current portion		100	100	101	66
Operating lease liabilities, non-current	5,327
Total long-term liabilities	5,587	447	693	809	1,069
Total liabilities	76,312	65,506	61,291	74,226	77,580
Series A convertible preferred stock	3,138	3,138	3,138	3,138	3,138
Shareholders’ equity:
Preferred stock	0	0	0	0	0
Common stock	377,143	376,853	376,700	376,363	375,806
Accumulated deficit	(277,297)	(264,400)	(253,859)	(249,349)	(238,692)
Total shareholders’ equity	99,846	112,453	122,841	127,014	137,114
Total liabilities, convertible preferred stock and shareholders’ equity	179,296	181,097	187,270	204,378	217,832
Adjustments
Current assets:
Cash and cash equivalents	0	0	0	0	0
Accounts receivable, less allowance	1,608	194	(19)	(44)	(39)
Finance receivables, net	229	467	422	381	339
Inventory, net	125	365	0	0	0
Prepaid expenses and other current assets	0	0	0	0	0
Total current assets	1,962	1,026	403	337	300
Non-current assets:
Finance receivables due after one year, net	(331)	1,046	980	928	859
Other assets	204	0	0	0	0
Property and equipment, net	1,425	410	306	190	77
Operating lease right-of-use assets	0
Intangibles, net	0	0	0	0	0
Goodwill	(204)	(204)	(204)	(204)	(204)
Total non-current assets	1,094	1,252	1,082	914	732
Total assets	3,056	2,278	1,485	1,251	1,032
Current liabilities:
Accounts payable	1,102	73	30	0	0
Accrued expenses	(105)	93	0	0	0
Capital lease obligations and current obligations under long-term debt	0	0	0	0	0
Income taxes payable	0	0	0	0	0
Deferred revenue	(1,300)	142	176	176	176
Total current liabilities	(303)	308	206	176	176
Long-term liabilities:
Deferred income taxes	0	0	0	0	0
Debt and other financing arrangements, noncurrent	0	0	0	0	0
Accrued expenses, less current portion		0	0	0	0
Operating lease liabilities, non-current	0
Total long-term liabilities	0	0	0	0	0
Total liabilities	(303)	308	206	176	176
Series A convertible preferred stock	0	0	0	0	0
Shareholders’ equity:
Preferred stock	0	0	0	0	0
Common stock	0	0	0	0	0
Accumulated deficit	3,359	1,970	1,279	1,075	856
Total shareholders’ equity	3,359	1,970	1,279	1,075	856
Total liabilities, convertible preferred stock and shareholders’ equity	$ 3,056	$ 2,278	$ 1,485	$ 1,251	$ 1,032