Income Taxes - Additional Information (Details) - USD ($) shares in Millions, $ in Millions		12 Months Ended
	Dec. 22, 2016	Dec. 31, 2016
Income Taxes [Line Items]
Statutory tax rate		35.00%
Net operating loss carryforward		$ 199.9
Deductions for excess stock-based compensation		2.2
Net operating loss carryforward written off		$ 141.7
Operating loss carryforwards annual installment amount	$ 1.0
Depletion carryover amount	$ 10.0
Common Class A
Income Taxes [Line Items]
Sale of common stock, net of offering costs (in shares)	13.8