Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 60,223	$ 18,752
Short-term investments	112,404	122,296
Accounts receivable	13,462	14,700
Note receivable from Viking	3,207	3,207
Inventory	6,809	1,923
Other current assets	1,072	2,175
Total current assets	197,177	163,053
Deferred income taxes	138,837	123,891
Investment in Viking	6,014	8,345
Intangible assets, net	199,284	204,705
Goodwill	72,207	72,207
Commercial license rights, net	22,962	25,821
Property and equipment, net	1,875	1,819
Other assets	1,668	1,744
Total assets	640,024	601,585
Current liabilities:
Accounts payable	1,799	2,734
Accrued liabilities	5,325	6,397
Current contingent liabilities	86	5,088
2019 Convertible Senior Notes, net	218,630	212,910
Total current liabilities	225,840	227,129
Long-term contingent liabilities	3,860	2,916
Other long-term liabilities	915	687
Total liabilities	230,615	230,732
Commitments and Contingencies
Equity component of currently redeemable convertible notes (Note 5)	24,293	29,563
Stockholders' equity:
Common stock, $0.001 par value; 33,333,333 shares authorized; 21,049,741 and 20,909,301 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	21	21
Additional paid-in capital	784,376	769,653
Accumulated other comprehensive income	3,059	2,743
Accumulated deficit	(402,340)	(431,127)
Total stockholders' equity	385,116	341,290
Total liabilities and stockholders' equity	$ 640,024	$ 601,585