Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 160,380	$ 411,848
Short-term investments	237,638
Short-term investments		28,883
Accounts receivable, net	32,046	31,100
Inventory, net	28,697	22,959
Prepaid expenses and other	7,376	4,190
Total current assets	466,137	498,980
Property and equipment, net	21,531	20,828
Operating lease right-of-use assets	19,930	21,492
Other assets	5,460	2,895
Total assets	513,058	544,195
Current liabilities:
Accounts payable	10,963	5,313
Accrued liabilities	5,526	4,970
Accrued compensation and other employee benefits	14,277	15,262
Customer deposits	1,482	1,631
Deferred revenue, current portion	6,383	5,610
Operating lease liabilities, current portion	4,492	4,313
Total current liabilities	43,123	37,099
Deferred revenue, net of current portion	2,450	1,843
Long-term debt, net	224,424	172,703
Operating lease liabilities, net of current portion	23,334	25,602
Total liabilities	293,331	237,247
Commitment and contingencies (Note 11)
Stockholders’ equity:
Preferred stock, $0.0001 par value, 15,000 shares authorized; none issued	0	0
Common stock, $0.0001 par value, 150,000 shares authorized; 45,502 and 44,441 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	5	4
Additional paid-in capital	809,015	848,891
Accumulated other comprehensive income (loss)	(62)	83
Accumulated deficit	(589,231)	(542,030)
Total stockholders’ equity	219,727	306,948
Total liabilities and stockholders’ equity	$ 513,058	$ 544,195