CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 49,796	$ 23,636
Short-term investments	69,551	82,453
Accounts receivable, net	23,505	25,003
Inventory, net	28,067	36,329
Prepaid expenses and other current assets	2,810	3,943
Total current assets	173,729	171,364
Property and equipment, net	20,797	16,531
Operating lease right-of-use assets	13,736	13,761
Other non-current assets	2,349	2,079
Goodwill	3,881	3,881
Total assets	214,492	207,616
Current liabilities:
Accounts payable	8,799	10,144
Accrued compensation and employee related benefits	5,874	5,529
Accrued and other current liabilities	2,304	1,468
Current portion of operating lease liabilities	3,813	3,641
Current portion of restructuring liabilities	1,235
Current portion of long-term debt	83,951
Current portion of deferred revenue	6,209	6,811
Total current liabilities	112,185	27,593
Long-term debt, net of current portion		54,556
Operating lease liabilities, net of current portion	14,881	15,266
Other long-term liabilities	805	805
Deferred revenue, net of current portion	246	277
Total liabilities	128,117	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 March 31, 2021 and December 31, 2020
Common stock, $0.001 par value — 495,000 shares authorized, 24,052 and 23,350 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively	24	23
Additional paid-in capital	406,988	423,759
Accumulated other comprehensive income	3	3
Accumulated deficit	(320,640)	(314,666)
Total stockholders' equity	86,375	109,119
Total liabilities and stockholders' equity	$ 214,492	$ 207,616