Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 10,641	$ 18,752
Short-term investments	148,733	122,296
Accounts receivable	7,057	14,700
Note receivable from Viking	0	3,207
Inventory	7,629	1,923
Other current assets	641	2,175
Total current assets	174,701	163,053
Deferred income taxes	141,007	123,891
Investment in Viking	7,262	8,345
Note receivable from Viking	3,207	0
Intangible assets, net	201,990	204,705
Goodwill	72,207	72,207
Commercial license rights, net	25,630	25,821
Property and equipment, net	1,898	1,819
Other assets	1,821	1,744
Total assets	629,723	601,585
Current liabilities:
Accounts payable	6,456	2,734
Accrued liabilities	4,680	6,397
Current contingent liabilities	111	5,088
2019 Convertible Senior Notes, net	215,748	212,910
Total current liabilities	226,995	227,129
Long-term contingent liabilities	3,035	2,916
Other long-term liabilities	915	687
Total liabilities	230,945	230,732
Commitments and Contingencies
Equity component of currently redeemable convertible notes (Note 5)	26,948	29,563
Stockholders' equity:
Common stock, $0.001 par value; 33,333,333 shares authorized; 20,996,049 and 20,909,301 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	21	21
Additional paid-in capital	777,102	769,653
Accumulated other comprehensive income	3,105	2,743
Accumulated deficit	(408,398)	(431,127)
Total stockholders' equity	371,830	341,290
Total liabilities and stockholders' equity	$ 629,723	$ 601,585