CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 98,578	$ 94,613
Short-term investments	446,724	390,323
Accounts receivable, net	80,212	82,195
Inventories	66,705	63,721
Prepaid and other current assets	6,066	6,383
Total current assets	698,285	637,235
Property and equipment, net	48,890	50,022
Operating lease right-of-use assets	31,499	19,773
Other long-term assets	16,576	9,385
Total assets	795,250	716,415
Current liabilities:
Accounts payable	27,504	17,805
Accrued expenses	6,405	4,783
Employee-related liabilities	36,476	34,159
Deferred revenue	7,953	6,082
Common stock warrants	2,789	14,261
Operating lease liabilities	9,260	9,421
Other current liabilities	18,336	17,341
Total current liabilities	108,723	103,852
Convertible senior notes, net - long-term	280,599	202,984
Operating lease liabilities - long-term	27,376	15,914
Other long-term liabilities	32,467	27,360
Total liabilities	449,165	350,110
Commitments and contingencies (Note 11)
Stockholders’ equity:
Common stock, $0.001 par value; 200,000 shares authorized, 62,952 and 62,335 shares issued and outstanding at June 30, 2021 (unaudited) and December 31, 2020, respectively.	63	62
Additional paid-in capital	997,190	1,025,233
Accumulated other comprehensive income	29	220
Accumulated deficit	(651,197)	(659,210)
Total stockholders’ equity	346,085	366,305
Total liabilities and stockholders’ equity	$ 795,250	$ 716,415