Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 5,943	$ 8,819
Short-term investments	1	4,078
Accounts receivable, net of allowances for doubtful accounts and other adjustments of $150 (2016) and $201 (2015)	5,257	8,145
Income tax receivable	17	13
Inventories, net of reserves for excess and obsolete inventory of $148 (2016) and $158 (2015)	18	39
Prepaid expenses and other current assets	1,225	692
Total current assets	12,461	21,786
Equipment and improvements, net	1,834	2,492
Other assets	154	195
Intangible assets, net	1,241
Goodwill	3,368
Total assets	19,058	24,473
Current liabilities:
Accounts payable	1,775	1,708
Accrued liabilities	4,665	5,064
Warrant liability	1,761
Deferred revenue	591	440
Total current liabilities	8,792	7,212
Non-current liabilities:
Related-party notes payable, net of discount of $1,117 and $0, respectively	883
Notes payable, net of discount of $1,117 and $0, respectively	883
Deferred rent and other long-term liabilities	3,108	3,235
Total non-current liabilities	4,874	3,235
Commitments and contingencies
Stockholders' equity:
Preferred stock, par value $0.001 per share; 5,000,000 shares authorized; none issued or outstanding
Common stock, par value $0.001 per share; 100,000,000 shares authorized; 12,316,479 and 11,432,318 shares issued and outstanding at September 30, 2016 and December 31, 2015, respectively	12	46
Additional paid-in capital	227,565	224,867
Accumulated comprehensive deficit	(222,185)	(210,887)
Total stockholders' equity	5,392	14,026
Total liabilities and stockholders' equity	$ 19,058	$ 24,473