Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 345,080	$ 159,317
Accounts receivable	17,629	19,329
Supplies	4,456	6,806
Prepaid expenses and other current assets	3,150	2,235
Total current assets	370,315	187,687
Property and equipment, net	8,914	8,933
Right-of-use assets - operating lease	8,094	8,808
Finite-lived intangible assets, net	61,197	65,019
Goodwill	2,725	2,725
Restricted cash	603	603
Other assets	2,303	1,437
Total assets	454,151	275,212
Current liabilities:
Accounts payable	1,932	2,328
Accrued liabilities	10,445	13,734
Current portion of operating lease liability	1,542	1,407
Total current liabilities	13,919	17,469
Long-term debt	756	694
Acquisition-related contingent consideration	6,420	6,088
Operating lease liability, net of current portion	10,331	11,506
Total liabilities	31,426	35,757
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized, no shares issued and outstanding as of September 30, 2020 and December 31, 2019	0	0
Common stock, $0.001 par value; 125,000,000 shares authorized, 57,813,833 and 49,625,341 shares issued and outstanding as of September 30, 2020 and December 31, 2019, respectively	58	50
Additional paid-in capital	696,217	486,090
Accumulated deficit	(273,550)	(246,685)
Total stockholders’ equity	422,725	239,455
Total liabilities and stockholders’ equity	$ 454,151	$ 275,212