Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 225,302	$ 117,164
Short-term investments	874,383	601,217
Investment in Viking	49,856	55,448
Accounts receivable, net	21,958	55,850
Inventory	6,565	7,124
Derivative asset	0	22,576
Other current assets	5,039	11,161
Total current assets	1,183,103	870,540
Deferred income taxes, net	0	46,521
Intangible assets, net	216,268	219,793
Goodwill	93,513	86,646
Commercial license and other economic rights, net	35,413	31,460
Property and equipment, net	6,411	5,372
Operating lease right-of-use assets	10,280	0
Other assets	2,488	471
Total assets	1,547,476	1,260,803
Current liabilities:
Accounts payable	2,040	4,183
Accrued liabilities	13,060	19,200
Income tax payable	16,571	0
Current contingent liabilities	1,794	5,717
Deferred revenue	2,230	3,286
2019 convertible senior notes, net	0	26,433
Derivative liability	0	23,430
Total current liabilities	35,695	82,249
2023 convertible senior notes, net	631,533	609,864
Long-term contingent liabilities	7,995	6,825
Deferred income taxes, net	3,761	0
Long-term operating lease liabilities	9,932	0
Other long-term liabilities	7,979	951
Total liabilities	696,895	699,889
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000 shares authorized; none issued and outstanding at September 30, 2019 and December 31, 2018	0	0
Common stock, $0.001 par value; 60,000 shares authorized; 17,563 and 20,766 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	17	21
Additional paid-in capital	444,587	791,114
Accumulated other comprehensive loss	(1,493)	(1,024)
Retained earnings (accumulated deficit)	407,470	(229,197)
Total stockholders' equity	850,581	560,914
Total liabilities and stockholders' equity	$ 1,547,476	$ 1,260,803