Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Significant Changes in Our Contract Liabilities (Detail)

v3.19.1
Summary of Significant Accounting Policies - Significant Changes in Our Contract Liabilities (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Change in Contract with Customer, Liability [Abstract]  
Short Term, Balance, beginning of period $ 12,763
Short Term, Revenue recognized during the period that was included in the beginning balance of contract liabilities (7,843)
Short Term, Additional amounts recognized during the period 21,460
Short Term, Revenue recognized during the period that was recorded during the period (16,245)
Short Term, Transfers 1,402
Short Term, Balance, end of period 11,537
Short Term, Amount refundable at beginning of period 12,450
Short Term, Amount refundable at end of period 11,410
Long-Term, Balance, beginning of period 1,951
Long-Term, Revenue recognized during the period that was included in the beginning balance of contract liabilities 0
Long-Term, Additional amounts recognized during the period 830
Long-Term, Revenue recognized during the period that was recorded during the period 0
Long-Term, Transfers (1,402)
Long-Term, Balance, end of period 1,379
Long-Term, Amount refundable at beginning of period 1,677
Long-Term, Amount refundable at end of period $ 1,379