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Revenue recognition - Cash Flow Impacts (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash flows from operating activities |  |
Net loss | $ (19,263) | $ (29,057)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 6,022 | 612
Non-cash interest expense | 1,780 | 1,600
Amortization of premiums on investments | (96) | 208
Amortization of debt issuance costs | 126 | 80
Share-based compensation expense | 7,748 | 9,029
Unrealized foreign currency transaction (gains) losses, net | (1,300) | 820
Changes in operating assets and liabilities: |  |
Inventory, net | (1,446) | (1,350)
Prepaid expenses and other current assets | 958 | 93
Trade receivables, net | (4,223) | (6,746)
Deposits and other assets | (308) | (226)
Accounts payable and accrued expenses | (6,810) | (3,923)
Other liabilities | (475) | (624)
Deferred revenue | 1,409 | 582
Net cash used in operating activities | (15,878) | (28,902)
Cash flows from investing activities |  |
Purchases of fixed assets | (479) | (225)
Purchases of marketable securities | (22,683) | (19,467)
Sale and redemption of marketable securities | 21,514 | 44,110
Net cash (used in) provided by investing activities | (1,648) | 24,418
Cash flows from financing activities |  |
Proceeds from exercise of options | 1,136 | 106
Net cash provided by financing activities | 1,136 | 663
Effect of exchange rate changes on cash | 2,273 | (394)
Net decrease in cash and cash equivalents | (14,117) | (4,215)
Cash and cash equivalents, beginning of period | 111,792 | 58,321
Cash and cash equivalents, end of period | 97,675 | $ 54,106
Adjustments | ASU 2014-09 |  |
Cash flows from operating activities |  |
Net loss | (749) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 0 |
Non-cash interest expense | 0 |
Amortization of premiums on investments | 0 |
Amortization of debt issuance costs | 0 |
Share-based compensation expense | 0 |
Unrealized foreign currency transaction (gains) losses, net | 0 |
Changes in operating assets and liabilities: |  |
Inventory, net | (80) |
Prepaid expenses and other current assets | 0 |
Trade receivables, net | 0 |
Deposits and other assets | 0 |
Accounts payable and accrued expenses | (839) |
Other liabilities | 0 |
Deferred revenue | 1,668 |
Net cash used in operating activities | 0 |
Cash flows from investing activities |  |
Purchases of fixed assets | 0 |
Purchases of marketable securities | 0 |
Sale and redemption of marketable securities | 0 |
Net cash (used in) provided by investing activities | 0 |
Cash flows from financing activities |  |
Proceeds from exercise of options | 0 |
Net cash provided by financing activities | 0 |
Effect of exchange rate changes on cash | 0 |
Net decrease in cash and cash equivalents | 0 |
Cash and cash equivalents, beginning of period | 0 |
Cash and cash equivalents, end of period | 0 |
Balances without adoption of Topic 606 |  |
Cash flows from operating activities |  |
Net loss | (20,012) |
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Depreciation and amortization | 6,022 |
Non-cash interest expense | 1,780 |
Amortization of premiums on investments | (96) |
Amortization of debt issuance costs | 126 |
Share-based compensation expense | 7,748 |
Unrealized foreign currency transaction (gains) losses, net | (1,300) |
Changes in operating assets and liabilities: |  |
Inventory, net | (1,526) |
Prepaid expenses and other current assets | 958 |
Trade receivables, net | (4,223) |
Deposits and other assets | (308) |
Accounts payable and accrued expenses | (7,649) |
Other liabilities | (475) |
Deferred revenue | 3,077 |
Net cash used in operating activities | (15,878) |
Cash flows from investing activities |  |
Purchases of fixed assets | (479) |
Purchases of marketable securities | (22,683) |
Sale and redemption of marketable securities | 21,514 |
Net cash (used in) provided by investing activities | (1,648) |
Cash flows from financing activities |  |
Proceeds from exercise of options | 1,136 |
Net cash provided by financing activities | 1,136 |
Effect of exchange rate changes on cash | 2,273 |
Net decrease in cash and cash equivalents | (14,117) |
Cash and cash equivalents, beginning of period | 111,792 |
Cash and cash equivalents, end of period | $ 97,675 |

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition The increase (decrease) during the reporting period in moneys or securities given as security including, but not limited to, contract, escrow, or earnest money deposits, retainage (if applicable), deposits with clearing organizations and others, collateral, or margin deposits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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