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Significant Accounting Policies - Adjustments (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Accounts receivable, net $ 55,746   $ 80,883 $ 80,392
Prepaid expenses and other current assets 12,551   10,514 10,759
Other assets 1,943   1,457 759
Accrued liabilities 48,783     49,279
Total assets 270,912   296,014 295,070
Deferred revenue 14,676   12,247 13,076
Total liabilities 132,873   149,278 150,107
Accumulated deficit (677,320)   (665,584) (667,357)
Total liabilities and stockholders’ equity 270,912   296,014 295,070
Systems 93,291 $ 91,605    
Services 6,112 25,913    
Total revenue 99,403 117,518    
Systems [1] 51,633 57,373    
Services [1] 5,711 25,768    
Total cost of revenue 57,344 83,141    
Gross profit 42,059 34,377    
Sales and marketing [1] 19,901 22,429    
Net loss (11,736) $ (33,325)    
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Accounts receivable, net 53,675     80,392
Prepaid expenses and other current assets 13,574     10,759
Other assets 1,244     759
Accrued liabilities 47,824      
Total assets 269,165     295,070
Deferred revenue 16,103     13,076
Total liabilities 133,341     150,107
Accumulated deficit (679,535)     (667,357)
Total liabilities and stockholders’ equity 269,165     $ 295,070
Systems 92,610      
Services 5,573      
Total revenue 98,183      
Systems [1] 51,148      
Services [1] 5,433      
Total cost of revenue 56,581      
Gross profit 41,602      
Sales and marketing [1] 19,886      
Net loss (12,178)      
Accounting Standards Update 2014-09        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Accumulated deficit     1,800  
Total revenue 1,200      
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Accounts receivable, net (2,071)   491  
Prepaid expenses and other current assets 1,023   (245)  
Other assets (699)   698  
Accrued liabilities (959)      
Total assets (1,747)   944  
Deferred revenue 1,427   (829)  
Total liabilities 468   (829)  
Accumulated deficit (2,215)   1,773  
Total liabilities and stockholders’ equity (1,747)   $ 944  
Systems (681)      
Services (539)      
Total revenue (1,220)      
Systems [1] (485)      
Services [1] (278)      
Total cost of revenue (763)      
Gross profit (457)      
Sales and marketing [1] (15)      
Net loss $ (442)      
[1] Includes stock-based compensation as follows: Three and Nine Months Ended March 31, 2018 and April 1, 2017; Cost of revenue: Products - $112, $116, $349, $338 ; Services - $77, $56, $200, $146; Research and development - $983, $1,326, $3,663, $3,719; Sales and marketing - $850, $1,111, $2,581, $3,323; General administrative - $735, $931, $2,521, $2,840;