Intangible Assets - Costs Accumulated to Acquire Intangible Asset; and Consideration Transferred (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Acquisition consideration:
Upfront cash paid	$ 18,877
Minimum royalty payment obligation	112,719
Rebates, incentives, trade allowances and chargebacks assumed	22,660
Warrant issued	8,043
Total acquisition consideration	162,299
Consideration transferred to assets acquired:
Nucynta Intangible Asset	154,089
Inventory	6,223
Prepaid expenses	1,987
Total consideration allocated to assets acquired	$ 162,299