Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 2,117	$ 2,935
Restricted cash	50	50
Accounts and other receivables (net of allowance for bad debts of $858 at March 31, 2020 and $709 at December 31, 2019)	3,099	4,096
Finished goods inventory	1,257	1,317
Prepaid expenses and other current assets (Note 3)	1,985	1,711
Total current assets	8,508	10,109
Property and equipment, net	12	16
Operating lease right-of-use assets (Note 6)	686	758
Other intangible assets, net	28,257	28,674
Other assets	95	99
Total assets	37,558	39,656
Current liabilities:
Accounts payable	3,750	4,263
Accrued and other liabilities (Note 3)	3,499	3,821
Warranty liability, current	171	105
Debt, current portion, net of deferred financing costs	3,046	1,909
Operating lease liabilities, current (Note 6)	297	291
Total current liabilities	10,763	10,389
Debt, noncurrent portion	2,763	2,728
Operating lease liabilities, noncurrent (Note 6)	402	477
Warranty liability, noncurrent	1,360	1,253
Deferred income taxes	702	702
Total liabilities	15,990	15,549
Commitments, contingencies and subsequent events (Note 12 and Note 13)
Stockholders’ equity:
Common stock, $0.001 par value; 275,000,000 shares authorized at March 31, 2020 and December 31, 2019; 391,739 shares issued and outstanding at March 31, 2020 and December 31, 2019
Additional paid-in capital	519,131	517,311
Accumulated deficit	(497,508)	(493,197)
Accumulated other comprehensive loss	(56)	(8)
Total stockholders’ equity	21,568	24,107
Total liabilities and stockholders’ equity	37,558	39,656
Series B convertible preferred stock
Stockholders’ equity:
Preferred stock, 5,000,000 shares authorized:
Series C convertible preferred stock
Stockholders’ equity:
Preferred stock, 5,000,000 shares authorized:	$ 1	$ 1