CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 51,175	$ 23,636
Short-term investments	60,788	82,453
Accounts receivable, net	25,976	25,003
Inventory, net	24,064	36,329
Prepaid expenses and other current assets	3,670	3,943
Total current assets	165,673	171,364
Property and equipment, net	26,306	16,531
Operating lease right-of-use assets	13,001	13,761
Other non-current assets	2,561	2,079
Goodwill	3,881	3,881
Total assets	211,422	207,616
Current liabilities:
Accounts payable	10,671	10,144
Accrued compensation and employee related benefits	5,951	5,529
Accrued and other current liabilities	2,245	1,468
Current portion of operating lease liabilities	3,901	3,641
Restructuring liabilities	630
Current portion of long-term debt	84,045
Current portion of deferred revenue	263	6,811
Total current liabilities	107,706	27,593
Long-term debt, net of current portion		54,556
Operating lease liabilities, net of current portion	13,870	15,266
Other long-term liabilities	803	805
Deferred revenue, net of current portion	272	277
Total liabilities	122,651	98,497
Commitments and contingencies (Note 5)
Stockholders' equity:
Preferred stock, $0.001 par value — 5,000 shares authorized, no shares issued and outstanding at June 30, 2021 and December 31, 2020
Common stock, $0.001 par value — 495,000 shares authorized,24,254 and 23,350 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	24	23
Additional paid-in capital	418,289	423,759
Accumulated other comprehensive income	4	3
Accumulated deficit	(329,546)	(314,666)
Total stockholders' equity	88,771	109,119
Total liabilities and stockholders' equity	$ 211,422	$ 207,616