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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;

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