CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 17,593	$ 19,285
Short-term investments	37,069	38,831
Accounts receivable, net	19,588	22,244
Inventory	49,195	47,083
Prepaid expenses and other current assets	2,020	2,359
Total current assets	125,465	129,802
Property and equipment, net	20,552	18,110
Other non-current assets	202	241
Goodwill and other intangible assets, net	3,881	3,881
Total assets	150,100	152,034
Current liabilities:
Accounts payable	3,441	4,666
Accrued compensation and employee related benefits	4,903	5,729
Accrued liabilities	7,514	3,162
Accrued restructuring costs	1,038
Current portion of long-term debt	4,261	4,088
Current portion of capital lease obligations	593	936
Current portion of deferred rent	385	628
Current portion of deferred revenue	719	714
Total current liabilities	22,854	19,923
Long-term debt, net of current portion	19,533	5,500
Capital lease obligations, net of current portion	371	745
Long-term liabilities — other	738	532
Long-term restructuring liabilities	538
Deferred rent, net of current portion	5,395	5,891
Deferred revenue, net of current portion	208	501
Total liabilities	49,637	33,092
Stockholders' equity:
Preferred stock, $0.001 par value — 5,000 shares authorized, no shares issued and outstanding at September 30, 2018 and December 31, 2017
Common stock, $0.001 par value — 495,000 shares authorized, 21,482 and 20,973 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	21	21
Additional paid-in capital	334,228	323,482
Accumulated other comprehensive loss	(17)	(36)
Accumulated deficit	(233,769)	(204,525)
Total stockholders' equity	100,463	118,942
Total liabilities and stockholders' equity	$ 150,100	$ 152,034