CONDENSED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current Assets
Cash and cash equivalents	$ 406,981	$ 409,852
Accounts receivable, net	14,292	12,759
Inventory	2,310	2,217
Prepaid expenses and other current assets	3,087	4,766
Total current assets	426,670	429,594
Long-term accounts receivable, net	1,121	1,096
Property and equipment, net	7,780	7,102
Other assets – long-term	1,761	1,536
Total assets	437,332	439,328
Current Liabilities
Accounts payable	2,172	2,098
Accrued compensation	5,208	9,108
Medicare advance payment	8,178	6,615
Other accrued liabilities	2,020	3,055
Total current liabilities	17,578	20,876
Noncurrent portion of Medicare advance payment	172	1,735
Deferred rent and other liabilities	995	1,026
Total liabilities	18,745	23,637
Commitments and Contingencies (Note 8)
Stockholders’ Equity
Preferred stock, $0.001 par value; 10,000,000 shares authorized as of March 31, 2021 and December 31, 2020; no shares issued and outstanding as of March 31, 2021 and December 31, 2020.	0	0
Common stock, $0.001 par value; 200,000,000 shares authorized as of March 31, 2021 and December 31, 2020; 25,054,513 and 24,812,487 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively.	25	25
Additional paid-in capital	485,338	478,162
Accumulated deficit	(66,776)	(62,496)
Total stockholders’ equity	418,587	415,691
Total liabilities and stockholders’ equity	$ 437,332	$ 439,328