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Other Long-Term Liabilities (Tables)
6 Months Ended
Jun. 30, 2019
Notes to Financial Statements  
Schedule of other long-term liabilities

   June 30,   December 31, 
   2019   2018 
Deferred rent expense  $2,801   $2,531 
Warranty accrual   4,725    2,009 
Capital leases   460    117 
Total other long-term liabilities   7,986    4,657 
Less: current portion of long-term liabilities   (1,296)   (925)
Other long-term liabilities, net of current portion  $6,690   $3,732