CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 18,661	$ 17,530
Short-term investments	37,986	38,543
Accounts receivable, net	17,958	18,462
Inventory	41,219	44,725
Prepaid expenses and other current assets	1,489	1,954
Total current assets	117,313	121,214
Property and equipment, net	18,762	19,778
Operating lease right-of-use assets	18,235
Other non-current assets	286	196
Goodwill	3,881	3,881
Total assets	158,477	145,069
Current liabilities:
Accounts payable	5,483	4,643
Accrued compensation and employee related benefits	4,109	7,409
Accrued liabilities	2,766	2,887
Current portion of operating lease liabilities	3,122
Current portion of restructuring liabilities	94	582
Current portion of long-term debt	7,603	5,930
Current portion of finance lease liabilities	476	523
Current portion of deferred rent		402
Current portion of deferred revenue	849	649
Total current liabilities	24,502	23,025
Long-term debt, net of current portion	15,728	17,633
Operating lease liabilities, net of current portion	21,464
Finance lease liabilities, net of current portion	158	258
Long-term liabilities — other	302	304
Long-term restructuring liabilities		487
Deferred rent, net of current portion		5,294
Deferred revenue, net of current portion	152	185
Total liabilities	62,306	47,186
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, $0.001 par value — 5,000 shares authorized, no shares issued and outstanding at March 31, 2019 and December 31, 2018
Common stock, $0.001 par value — 495,000 shares authorized, 21,627 and 21,492 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	22	21
Additional paid-in capital	342,966	337,627
Accumulated other comprehensive income (loss)	7	(9)
Accumulated deficit	(246,824)	(239,756)
Total stockholders' equity	96,171	97,883
Total liabilities and stockholders' equity	$ 158,477	$ 145,069