Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 2,935	$ 5,548
Restricted cash	50
Accounts and other receivables (net of allowance for bad debts of $709 at December 31, 2019 and $236 at December 31, 2018)	4,096	917
Finished goods inventory	1,317	985
Prepaid expenses and other current assets (Note 6)	1,711	1,269
Total current assets	10,109	8,719
Property and equipment, net	16	64
Operating lease right-of-use assets (Note 11)	758
Other intangible assets, net (Note 8)	28,674	36,927
Other assets	99	563
Total assets	39,656	46,273
Current liabilities:
Accounts payable	4,263	1,627
Accrued and other liabilities (Note 6)	3,821	4,829
Warranty liability, current (Note 14)	105
Asset purchase consideration payable, current (Note 10)	1,909	1,907
Operating lease liabilities, current (Note 11)	291
Total current liabilities	10,389	8,363
Asset purchase consideration payable, noncurrent (Note 10)	2,728	4,403
Operating lease liabilities, noncurrent (Note 11)	477
Warranty liability, noncurrent (Note 14)	1,253
Deferred income taxes	702	1,844
Total liabilities	15,549	14,610
Commitments and contingencies (Note 17)
Stockholders’ equity:
Additional paid-in capital	517,311	450,652
Accumulated deficit	(493,197)	(418,990)
Accumulated other comprehensive loss	(8)
Total stockholders’ equity	24,107	31,663
Total liabilities and stockholders’ equity	39,656	46,273
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