CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 40,063	$ 66,898
Short-term investments	65,057	49,597
Accounts receivable, net	17,730	23,735
Inventory	37,982	34,153
Prepaid expenses and other current assets	3,339	2,386
Total current assets	164,171	176,769
Property and equipment, net	16,365	17,442
Operating lease right-of-use assets	14,472	16,501
Other non-current assets	1,193	453
Goodwill	3,881	3,881
Total assets	200,082	215,046
Current liabilities:
Accounts payable	8,597	5,600
Accrued compensation and employee related benefits	4,062	5,859
Accrued liabilities	2,334	3,755
Current portion of operating lease liabilities	3,618	3,380
Current portion of deferred revenue	953	551
Other current liabilities	19	352
Total current liabilities	19,583	19,497
Long-term debt, net of current portion	53,595	50,876
Operating lease liabilities, net of current portion	16,160	18,907
Long-term liabilities — other	1,056	314
Deferred revenue, net of current portion	260	213
Total liabilities	90,654	89,807
Commitments and contingencies (Note 5)
Stockholders' equity:
Preferred stock, $0.001 par value — 5,000 shares authorized, no shares issued and outstanding at September 30, 2020 and December 31, 2019
Common stock, $0.001 par value — 495,000 shares authorized, 23,001 and 22,217 shares issued and outstanding at September 30, 2020 and December 31, 2019, respectively	23	22
Additional paid-in capital	408,342	387,926
Accumulated other comprehensive income	12	34
Accumulated deficit	(298,949)	(262,743)
Total stockholders' equity	109,428	125,239
Total liabilities and stockholders' equity	$ 200,082	$ 215,046