Related Party Transactions - Schedule of Purchases from or Operating Expenses Paid to Related Parties (Detail) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Related Party Transaction [Line Items] | ||
| Purchases from, or operating expenses paid | $ 459 | $ 164 |
| Stamax Corp. [Member] | ||
| Related Party Transaction [Line Items] | ||
| Purchases from, or operating expenses paid | 9 | |
| Nirvana Corp [Member] | ||
| Related Party Transaction [Line Items] | ||
| Purchases from, or operating expenses paid | 6 | |
| Smash Technologies LLC [Member] | ||
| Related Party Transaction [Line Items] | ||
| Purchases from, or operating expenses paid | $ 459 | $ 149 |