CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 4,988	$ 21,572
Short-term investments	88,615	69,552
Accounts receivable, net	11,747	7,549
Inventory	6,453	4,097
Prepaid expenses and other current assets	2,708	1,290
Restricted cash	80	80
Total current assets	114,591	104,140
Property and equipment, net	6,994	2,154
Intangible asset, net	7,479	10,218
Deposits and other assets	188	149
Total assets	129,252	116,661
Current liabilities:
Accounts payable	4,714	3,626
Accrued liabilities	11,048	7,793
Long-term debt, current portion	3,039	8,931
Deferred rent	40	12
Total current liabilities	18,841	20,362
Long-term debt, less current portion		765
Stock warrant liability		105
Other liabilities	208	238
Total liabilities	19,049	21,470
Commitments and contingencies (see Note 7)
Stockholders' equity (deficit):
Preferred stock, $0.001 par value; 5,000 shares authorized at September 30, 2016 and December 31, 2015; no shares issued and outstanding at September 30, 2016 and December 31, 2015
Common stock, $0.001 par value; 150,000 shares authorized at September 30, 2016 and December 31, 2015; 33,337 and 32,209 shares issued and 33,309 and 32,181 shares outstanding at September 30, 2016 and December 31, 2015, respectively	33	32
Additional paid-in capital	302,678	291,853
Accumulated other comprehensive (loss) income	(151)	51
Accumulated deficit	(192,225)	(196,613)
Total stockholders' equity before treasury stock	110,335	95,323
Less treasury stock (28 shares as of September 30, 2016 and December 31, 2015)	(132)	(132)
Total stockholders' equity	110,203	95,191
Total liabilities and stockholders' equity	$ 129,252	$ 116,661