Annual report pursuant to Section 13 and 15(d)

Condensed Financial Statements - Summary of Statements of Certain Statements of Cash Flows Amounts (Detail)

v3.19.1
Condensed Financial Statements - Summary of Statements of Certain Statements of Cash Flows Amounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Information Disclosure [Abstract]        
Cash and cash equivalents $ 93,794 $ 56,664 $ 5,026  
Restricted cash, current 381      
Non-current restricted cash 1,113      
Cash, cash equivalents, and restricted cash 95,288 56,664 5,026 $ 24,687
Interest Paid 1,086 200 $ 5  
Non-cash additions to land, buildings and equipment $ 7,994 $ 3,130