CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 24,319	$ 63,419
Short-term investments	90,095	83,560
Accounts receivable, net of allowance for doubtful accounts of $255 and $264, respectively	15,118	14,246
Inventory	16,484	11,498
Prepaid expenses and other current assets	2,325	3,143
Total current assets	148,341	175,866
Property and equipment, net	12,810	8,992
Operating lease right-of-use assets	4,611	5,248
Other non-current assets	385	400
TOTAL ASSETS	166,147	190,506
Current liabilities:
Accounts payable	5,141	3,198
Accrued liabilities and other	10,189	12,353
Current portion of long-term borrowings	0	0
Operating lease liabilities, current portion	1,342	1,339
Total current liabilities	16,672	16,890
Long-term borrowings	35,075	34,973
Operating lease liabilities, net of current portion	3,529	4,166
Other long-term liabilities	38	57
TOTAL LIABILITIES	55,314	56,086
Commitments and contingencies (Note 6)
STOCKHOLDERS’ EQUITY
Preferred stock, $0.0001 par value; 5,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.0001 par value; 100,000,000 shares authorized; 34,221,614 and 33,674,085 shares issued and outstanding, respectively	3	3
Additional paid-in capital	442,570	429,914
Accumulated other comprehensive income	32	352
Accumulated deficit	(331,772)	(295,849)
TOTAL STOCKHOLDERS’ EQUITY	110,833	134,420
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 166,147	$ 190,506