CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 59,030	$ 36,594
Short-term investments	63,811	97,000
Accounts receivable	22,865	21,166
Inventories, net	31,255	23,254
Prepaid and other current assets	8,629	5,417
Total current assets	185,590	183,431
Non-current assets:
Property and equipment, net	12,811	13,867
Goodwill	1,316	1,316
Operating lease right-of-use assets	12,477	13,122
Restricted cash	2,256	2,309
Other assets	8,773	7,370
Total assets	223,223	221,415
Current liabilities:
Accounts payable	30,891	24,213
Accrued liabilities	23,207	24,753
Debt – current	9,329	8,516
Operating lease liabilities – current	1,517	1,915
Deferred product revenue	871	577
Total current liabilities	65,815	59,974
Non-current liabilities:
Debt – non-current	54,682	39,588
Operating lease liabilities – non-current	16,319	16,873
Other non-current liabilities	2,170	1,174
Total liabilities	138,986	117,609
Commitments and contingencies
Stockholders' equity:
Common stock	172	168
Additional paid-in capital	1,026,534	1,012,932
Accumulated other comprehensive income	317	674
Accumulated deficit	(942,786)	(909,968)
Total stockholders' equity	84,237	103,806
Total liabilities and stockholders' equity	$ 223,223	$ 221,415