CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 32,580	$ 123,903
Short-term investments	130,719	69,443
Accounts receivable, net	40,128	35,449
Inventory	32,047	21,958
Prepaid expenses and other current assets	3,603	5,049
Total current assets	239,077	255,802
Long-term investments	20,440	14,225
Property and equipment, net	28,726	27,500
Operating lease right-of-use assets	10,044	11,667
Other non-current assets	2,240	2,462
Goodwill	3,881	3,881
Total assets	304,408	315,537
Current liabilities:
Accounts payable	10,099	11,732
Accrued compensation and employee related benefits	5,928	6,365
Accrued and other current liabilities	2,920	2,481
Current portion of operating lease liabilities	3,635	4,143
Restructuring liabilities	119	591
Current portion of long-term debt		9,633
Current portion of deferred revenue	2,632	558
Total current liabilities	25,333	35,503
Long-term debt, net of current portion	279,449	278,661
Operating lease liabilities, net of current portion	10,408	11,934
Other long-term liabilities	113	279
Deferred revenue, net of current portion	364	236
Total liabilities	315,667	326,613
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, 2022 and December 31, 2021
Common stock, $0.001 par value - 495,000 shares authorized, 25,547 and 24,737 shares issued and outstanding at June 30, 2022 and December 31, 2021, respectively	26	25
Additional paid-in capital	374,409	351,422
Accumulated other comprehensive (loss) income	(1,226)	(39)
Accumulated deficit	(384,468)	(362,484)
Total stockholders' equity	(11,259)	(11,076)
Total liabilities and stockholders' equity	$ 304,408	$ 315,537