Revenue Recognition - Schedule of Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Mar. 31, 2018
Contract Asset
Balance as of March 31, 2018	$ 4,819	$ 11,251
Change in estimate of sales returns, net of sales recognized	1,780
Actual returns	(8,212)
Balance as of June 30, 2018	4,819
Contract Liability
Balance as of March 31, 2018	11,517	$ 23,156
Change in estimate of sales returns, net of sales recognized	10,965
Actual returns	(22,604)
Balance as of June 30, 2018	$ 11,517