Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($)
|
3 Months Ended |
9 Months Ended |
12 Months Ended |
|
Jun. 30, 2016 |
Dec. 31, 2015 |
Sep. 30, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
|
| Transfers between level 1 and level 2, assets |
|
|
$ 0
|
|
|
| Transfers between level 2 and level 1, assets |
|
|
0
|
|
|
| Transfer of liabilities into level 3 |
|
|
0
|
|
|
| Transfer of liabilities out of level 3 |
|
|
0
|
|
|
| Impairment of intangible asset |
$ 104,500,000
|
$ 89,600,000
|
104,517,000
|
|
|
| Intangible assets |
|
101,500,000
|
|
$ 101,500,000
|
|
| Convertible Senior Unsecured Notes |
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
|
| Convertible senior notes |
|
|
287,500,000
|
|
|
| Convertible Senior Unsecured Notes | Fair Value, Inputs, Level 2 |
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
|
| Convertible senior notes, fair value |
|
|
273,800,000
|
|
|
| In Process Research and Development |
|
|
|
|
|
| Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |
|
|
|
|
|
| Impairment of intangible asset |
$ 104,500,000
|
|
104,517,000
|
89,557,000
|
|
| Intangible assets |
|
$ 101,500,000
|
$ 0
|
$ 101,500,000
|
$ 212,900,000
|