CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 16,931	$ 17,530
Short-term investments	46,151	38,543
Accounts receivable, net	24,803	18,462
Inventory	36,274	44,725
Prepaid expenses and other current assets	2,259	1,954
Total current assets	126,418	121,214
Property and equipment, net	16,704	19,778
Operating lease right-of-use assets	17,149
Other non-current assets	256	196
Goodwill	3,881	3,881
Total assets	164,408	145,069
Current liabilities:
Accounts payable	6,074	4,643
Accrued compensation and employee related benefits	4,908	7,409
Accrued liabilities	2,722	2,887
Current portion of operating lease liabilities	3,292
Current portion of restructuring liabilities	94	582
Current portion of long-term debt	3,200	5,930
Current portion of finance lease liabilities	353	523
Current portion of deferred rent		402
Current portion of deferred revenue	794	649
Total current liabilities	21,437	23,025
Long-term debt, net of current portion	20,183	17,633
Operating lease liabilities, net of current portion	19,778
Finance lease liabilities, net of current portion	18	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	154	185
Total liabilities	61,872	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 September 30, 2019 and December 31, 2018
Common stock, $0.001 par value — 495,000 shares authorized, 22,128 and 21,492 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	22	21
Additional paid-in capital	357,541	337,627
Accumulated other comprehensive income (loss)	36	(9)
Accumulated deficit	(255,063)	(239,756)
Total stockholders' equity	102,536	97,883
Total liabilities and stockholders' equity	$ 164,408	$ 145,069