Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 122,695	$ 151,570
Short-term investments	85,509	88,794
Accounts receivable, net	46,150	56,022
Inventory	28,324	27,059
Prepaid expenses and other current assets	10,899	8,310
Total current assets	293,577	331,755
Property, plant and equipment, net	53,283	54,260
Operating lease right-of-use assets	13,241	14,084
Other assets	2,627	1,946
Total assets	362,728	402,045
Current liabilities
Accounts payable	6,520	8,826
Accrued expenses and other current liabilities	82,792	90,723
Operating lease liabilities	4,052	4,923
Total current liabilities	93,364	104,472
Convertible notes, net	216,088	210,373
Deferred revenue, non-current	51,605	50,858
Long-term operating lease liabilities	9,914	10,206
Other non-current liabilities	2,125	2,168
Total liabilities	373,096	378,077
Commitments and contingencies (Note 12)
Stockholders’ (deficit) equity
Preferred stock, $0.001 par value; 15,000,000 shares authorized as of March 31, 2021 and December 31, 2020; none issued and outstanding	0	0
Common stock, $0.001 par value; 150,000,000 shares authorized as of March 31, 2021 and December 31, 2020; 46,893,822 and 46,821,644 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	47	47
Additional paid-in capital	1,110,714	1,103,074
Accumulated other comprehensive loss	(64)	(52)
Accumulated deficit	(1,121,065)	(1,079,101)
Total stockholders’ (deficit) equity	(10,368)	23,968
Total liabilities and stockholders’ (deficit) equity	$ 362,728	$ 402,045