Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 411,848	$ 29,033
Short-term investments	28,883	127,822
Accounts receivable, net	31,100	27,153
Inventory, net	22,959	19,781
Prepaid expenses and other	4,190	8,818
Total current assets	498,980	212,607
Property and equipment, net	20,828	20,184
Operating lease right-of-use assets	21,492	24,648
Other assets	2,895	2,315
Total assets	544,195	259,754
Current liabilities:
Accounts payable	5,313	10,282
Accrued liabilities	4,970	4,973
Accrued compensation and other employee benefits	15,262	15,579
Customer deposits	1,631	6,389
Deferred revenue and other liabilities, current portion	5,610	3,997
Operating lease liabilities, current portion	4,313	3,766
Total current liabilities	37,099	44,986
Deferred revenue and other liabilities, net of current portion	1,843	1,298
Long-term debt, net	172,703	79,951
Operating lease liabilities, net of current portion	25,602	29,368
Total liabilities	237,247	155,603
Commitments and contingencies (Note 16)
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; 44,441 and 36,298 shares issued and outstanding at December 31, 2020 and 2019, respectively	4	4
Additional paid-in-capital	848,891	535,954
Accumulated other comprehensive income	83	145
Accumulated deficit	(542,030)	(431,952)
Total stockholders’ equity	306,948	104,151
Total liabilities and stockholders’ equity	$ 544,195	$ 259,754
Preferred stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	15,000,000	15,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, shares outstanding (in shares)	44,441,000	36,298,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	44,441,000	36,298,000