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Investment in Viking Therapeutics, Inc. (Details) $ / shares in Units, $ in Thousands, shares in Millions | 1 Months Ended | 3 Months Ended | 13 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2016 USD ($) | May 31, 2015 USD ($) $ / shares shares | May 31, 2014 USD ($) program | Mar. 31, 2016 USD ($) | Mar. 31, 2015 USD ($) | May 31, 2015 $ / shares | Dec. 31, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Note receivable from Viking Therapeutics |  |  |  | $ 4,767 |  |  | $ 4,782
Change in fair value of the convertible debt receivable from Viking |  |  |  | $ 15 | $ 0 |  |
Viking |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Number of programs licensed | program |  |  | 5 |  |  |  |
Loss percentage recorded |  |  |  |  |  | 100.00% |
Debt | Viking |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Convertible loan facility |  |  | $ 2,500 |  |  |  |
Viking Therapeutics, Inc. |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Equity interest in outstanding common stock of Viking (percent) |  |  |  | 49.40% |  |  |
Note receivable, stated interest rate (percent) | 2.50% |  |  |  |  |  | 5.00%
LSA, lock-up period extension | 1 year |  |  |  |  |  |
Note receivable, amount due upon consummation of capital financing transaction | $ 1,500 |  |  |  |  |  |
Note receivable, cash due upon consummation of capital financing transaction | $ 300 |  |  |  |  |  |
Note receivable, repayment in equity (percent) | 200.00% |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Aggregate value of shares received under licensing agreement |  | $ 29,200 |  |  |  |  |
IPO shares purchased by the Company (shares) | shares |  | 1.1 |  |  |  |  |
Payments to acquire IPO shares |  | $ 9,000 |  |  |  |  |
Common Stock | Viking Therapeutics, Inc. | IPO |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |
Shares issued in IPO (shares) | shares |  | 3.7 |  |  |  |  |
IPO aggregate offering price |  | $ 29,200 |  |  |  |  |
IPO share price (USD per share) | $ / shares |  | $ 8.00 |  |  |  | $ 8.00 |

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