Income Taxes - Reconciliation of Effective Tax Rate to Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation Of Income Tax Rate [Line Items]
Net loss before income taxes	$ (54,013)	$ (143,097)	$ (6,729)
Tax benefit computed at statutory rate	(18,365)	(48,653)	(2,288)
Non-deductible impairment of goodwill	5,961
Non-deductible transaction costs	878
Non-taxable Oak Valley income prior to merger			(4,142)
Deferred income tax arising from change in tax status of Oak Valley			28,347
Non-deductible general and administrative expenses	5	534
Return to accrual	15	(1,398)
State income taxes, net of Federal benefit	(128)	(743)	188
Valuation allowance	12,162	23,818
Total income tax provision (benefit)	$ 528	$ (26,442)	$ 22,105
Effective tax rate	(1.00%)	18.50%	(328.50%)
U.S. [Member]
Reconciliation Of Income Tax Rate [Line Items]
Net loss before income taxes	$ (54,032)
Tax rate	34.00%
Tax benefit computed at statutory rate	$ (18,370)
Non-deductible impairment of goodwill	5,961
Non-deductible transaction costs	878
Non-deductible general and administrative expenses	5
Return to accrual	15
State income taxes, net of Federal benefit	(128)
Valuation allowance	12,167
Total income tax provision (benefit)	$ 528
Effective tax rate	(1.00%)
Canada [Member]
Reconciliation Of Income Tax Rate [Line Items]
Net loss before income taxes	$ 19
Tax rate	26.00%
Tax benefit computed at statutory rate	$ 5
Valuation allowance	$ (5)
Effective tax rate	0.00%