Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 6,410	$ 8,819
Short-term investments	720	4,078
Accounts receivable, net of allowances for doubtful accounts and other adjustments of $141 (2016) and $201 (2015)	5,444	8,145
Income tax receivable	18	13
Inventories, net of reserves for excess and obsolete inventory of $146 (2016) and $158 (2015)	24	39
Prepaid expenses and other current assets	1,211	692
Total current assets	13,827	21,786
Equipment and improvements, net	1,904	2,492
Goodwill	1,874
Intangible assets, net	613
Other assets	199	195
Total assets	18,417	24,473
Current liabilities:
Accounts payable	1,740	1,708
Accrued liabilities	5,007	5,064
Deferred revenue	1,069	440
Total current liabilities	7,816	7,212
Non-current liabilities:
Deferred rent and other long-term liabilities	2,970	3,235
Total non-current liabilities	2,970	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; 46,853,150 and 45,729,272 shares issued and outstanding at June 30, 2016 and December 31, 2015, respectively	47	46
Additional paid-in capital	225,455	224,867
Accumulated comprehensive deficit	(217,871)	(210,887)
Total stockholders' equity	7,631	14,026
Total liabilities and stockholders' equity	$ 18,417	$ 24,473