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Revenue from Contracts with Customers (ASC 606) - Financial Statement Impact of Adopting ASC 606 (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash, cash equivalent and marketable securities | $ 18,075 | $ 42,915 |  |  |
Accounts receivable, net | 29,663 | 28,316 | $ 28,316 |  |
Inventories | 22,942 | 22,732 | 22,732 |  |
Contract assets | 3,566 | 3,205 | 0 |  |
Prepaid expenses and other current assets | 3,494 | 3,816 | 3,816 |  |
Long-lived assets | 95,979 | 92,513 |  |  |
Other non-current assets | 6,736 | 5,927 | 5,927 |  |
Contract assets, long-term | 6,971 | 5,963 | 0 |  |
Non-current deferred income tax asset | 226 | 222 | 20 |  |
Total assets | 187,652 | 205,609 | 196,239 |  |
Accounts payable, accrued expenses, and other current liabilities | 46,817 | 36,430 |  |  |
Deferred revenue, current | 0 | 0 | 6,919 |  |
Contract liabilities | 9,193 | 11,039 | 0 |  |
Long-term contract liabilities | 9,070 | 7,998 | 0 |  |
Other long-term liabilities | 3,620 | 2,653 |  |  |
Long-term debt, excluding current portion | 19,437 | 44,572 | 44,572 |  |
Total liabilities | 88,137 | 102,692 | 90,574 |  |
Accumulated deficit | (15,397) | (7,165) | (4,417) |  |
Common stock, additional paid-in capital, and accumulated other comprehensive loss | 114,912 | 110,082 |  |  |
Total stockholders’ equity | 99,515 | 102,917 | 105,665 | $ 106,502 | $ 118,176
Total liabilities and stockholders’ equity | 187,652 | 205,609 | 196,239 |  |
As Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash, cash equivalent and marketable securities | 18,075 |  | 42,915 |  |
Accounts receivable, net | 29,663 |  | 28,316 |  |
Inventories | 22,942 |  | 22,732 |  |
Contract assets | 0 |  | 0 |  |
Prepaid expenses and other current assets | 3,494 |  | 3,816 |  |
Long-lived assets | 95,979 |  | 92,513 |  |
Other non-current assets | 6,736 |  | 5,927 |  |
Contract assets, long-term | 0 |  | 0 |  |
Non-current deferred income tax asset | 86 |  | 20 |  |
Total assets | 176,975 |  | 196,239 |  |
Accounts payable, accrued expenses, and other current liabilities | 46,817 |  | 36,430 |  |
Deferred revenue, current | 4,833 |  | 6,919 |  |
Contract liabilities | 0 |  | 0 |  |
Long-term contract liabilities | 0 |  | 0 |  |
Other long-term liabilities | 3,620 |  | 2,653 |  |
Long-term debt, excluding current portion | 19,437 |  | 44,572 |  |
Total liabilities | 74,707 |  | 90,574 |  |
Accumulated deficit | (12,644) |  | (4,417) |  |
Common stock, additional paid-in capital, and accumulated other comprehensive loss | 114,912 |  | 110,082 |  |
Total stockholders’ equity | 102,268 |  | 105,665 |  |
Total liabilities and stockholders’ equity | 176,975 |  | $ 196,239 |  |
Adjustments | Accounting Standards Update 2014-09 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash, cash equivalent and marketable securities |  | 0 |  |  |
Accounts receivable, net |  | 0 |  |  |
Inventories |  | 0 |  |  |
Contract assets |  | 3,205 |  |  |
Prepaid expenses and other current assets |  | 0 |  |  |
Long-lived assets |  | 0 |  |  |
Other non-current assets |  | 0 |  |  |
Contract assets, long-term |  | 5,963 |  |  |
Non-current deferred income tax asset |  | 202 |  |  |
Total assets | 10,677 | 9,370 |  |  |
Accounts payable, accrued expenses, and other current liabilities |  | 0 |  |  |
Deferred revenue, current |  | (6,919) |  |  |
Contract liabilities |  | 11,039 |  |  |
Long-term contract liabilities |  | 7,998 |  |  |
Other long-term liabilities |  | 0 |  |  |
Long-term debt, excluding current portion |  | 0 |  |  |
Total liabilities | $ 13,430 | 12,118 |  |  |
Accumulated deficit |  | (2,748) |  |  |
Common stock, additional paid-in capital, and accumulated other comprehensive loss |  | 0 |  |  |
Total stockholders’ equity |  | (2,748) |  |  |
Total liabilities and stockholders’ equity |  | $ 9,370 |  |  |

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