CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 71,543	$ 117,164
Short-term investments	939,989	601,217
Investment in Viking	58,335	55,448
Accounts receivable, net	30,387	55,850
Inventory	7,296	7,124
Derivative asset	0	22,576
Income taxes receivable	11,361	142
Other current assets	4,734	11,019
Total current assets	1,123,645	870,540
Deferred income taxes, net	25,608	46,521
Intangible assets, net	210,448	219,793
Goodwill	95,229	86,646
Commercial license and other economic rights	20,090	31,460
Property and equipment, net	7,185	5,372
Operating lease right-of-use assets	10,353	0
Other assets	2,357	471
Total assets	1,494,915	1,260,803
Current liabilities:
Accounts payable	2,420	4,183
Accrued liabilities	9,836	19,200
Current contingent liabilities	2,607	5,717
Deferred revenue	2,139	3,286
Derivative liability	0	23,430
2019 convertible senior notes, net	0	26,433
Total current liabilities	17,002	82,249
2023 convertible senior notes, net	638,959	609,864
Long-term contingent liabilities	6,335	6,825
Deferred income taxes, net	32,937	0
Long-term operating lease liabilities	9,970	0
Other long-term liabilities	22,480	951
Total liabilities	727,683	699,889
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000 shares authorized; zero issued and outstanding at December 31, 2019 and 2018	0	0
Common stock, $0.001 par value; 60,000 shares authorized; 16,823 and 20,766 shares issued and outstanding at December 31, 2019 and 2018, respectively	17	21
Additional paid-in capital	367,326	791,114
Accumulated other comprehensive loss	(216)	(1,024)
Retained earnings (accumulated deficit)	400,105	(229,197)
Total stockholders’ equity	767,232	560,914
Total liabilities and stockholders’ equity	$ 1,494,915	$ 1,260,803