v3.10.0.1
Revenue - Impact of Topic 606 (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Dec. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Other non-current assets $ 2,708   $ 2,708   $ 2,066
Total assets 203,163   203,163   184,376
Deferred revenue [1] 21,579   21,579   18,626
Total current liabilities 41,034   41,034   37,585
Other non-current liabilities 6,347   6,347   5,779
Total liabilities 49,136   49,136   44,656
Accumulated deficit (174,484)   (174,484)   (177,145)
Total stockholders' equity 102,423   102,423   89,461
Total liabilities, redeemable convertible preferred stock and stockholders' equity 203,163   203,163   $ 184,376
Revenue [2] 45,966 $ 41,972 93,291 $ 85,338  
Selling and marketing [3] 15,901 17,853 32,758 37,050  
Total operating expenses 36,414 33,375 72,906 67,240  
Operating (loss) income (271) (403) 1,119 332  
(Loss) income before income taxes (1,039) 605 913 1,641  
Net (loss) income (169) $ 1,673 2,528 $ 2,497  
Calculated under Revenue Guidance in Effect before Topic 606          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Other non-current assets 2,077   2,077    
Total assets 202,532   202,532    
Deferred revenue 21,335   21,335    
Total current liabilities 40,790   40,790    
Other non-current liabilities 6,169   6,169    
Total liabilities 48,714   48,714    
Accumulated deficit (174,693)   (174,693)    
Total stockholders' equity 102,214   102,214    
Total liabilities, redeemable convertible preferred stock and stockholders' equity 202,532   202,532    
Revenue [2] 46,100   93,594    
Selling and marketing [3] 16,185   33,137    
Total operating expenses 36,698   73,285    
Operating (loss) income (421)   1,043    
(Loss) income before income taxes (1,189)   837    
Net (loss) income (319)   2,452    
Difference between Revenue Guidance in Effect before and after Topic 606          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Other non-current assets 631   631    
Total assets 631   631    
Deferred revenue 244   244    
Total current liabilities 244   244    
Other non-current liabilities 178   178    
Total liabilities 422   422    
Accumulated deficit 209   209    
Total stockholders' equity 209   209    
Total liabilities, redeemable convertible preferred stock and stockholders' equity 631   631    
Revenue [2] 134   303    
Selling and marketing [3] 284   379    
Total operating expenses 284   379    
Operating (loss) income (150)   (76)    
(Loss) income before income taxes (150)   (76)    
Net (loss) income $ (150)   $ (76)    
[1] (5) Includes deferred revenue associated with related party of $92 and $2 at June 30, 2018 and December 30, 2017, respectively (Note 14)
[2] (1) Includes related party revenue of $705 and $432 for the three months ended June 30, 2018 and July 1, 2017, respectively. Includes related party revenue of $1,342 and $825 for the six months ended June 30, 2018 and July 1, 2017, respectively. (Note 14)
[3] (2) Includes related party expenses of $2,617 and $4,120 for the three months ended June 30, 2018 and July 1, 2017, respectively. Includes related party expenses of $5,653 and $7,820 for the six months ended June 30, 2018 and July 1, 2017, respectively. (Note 14)