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Stockholders' Equity (Narrative) (Details) | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
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Feb. 28, 2018 USD ($) $ / shares shares | Jan. 31, 2018 shares | Jun. 30, 2017 $ / shares shares | Jun. 30, 2017 $ / shares | Dec. 31, 2017 USD ($) item $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Aug. 31, 2017 USD ($) | Feb. 28, 2017 USD ($) | Feb. 28, 2013 $ / shares shares | Oct. 31, 2010 $ / shares shares
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common Stock, shares authorized | shares |  |  |  |  | 1,000,000,000 | 1,000,000,000 |  |  |  |  | 1,000,000,000
Common Stock, par value | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  |  | $ 0.001
Preferred Stock, shares authorized | shares |  |  |  |  | 50,000,000 | 50,000,000 |  |  |  |  | 50,000,000
Preferred Stock, par value | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 |  |  |  |  | $ 0.001
Preferred Stock, shares issued | shares |  |  |  |  | 0 | 0 |  |  |  |  |
Preferred Stock, shares outstanding | shares |  |  |  |  | 0 | 0 |  |  |  |  |
Common stock, dividends declared | $ / shares |  |  |  |  | $ 0 |  |  |  |  |  |
Voting right of common stock share holders |  |  |  |  | one |  |  |  |  |  |
Voting right of common stock share holdes, number of votes | item |  |  |  |  | 1 |  |  |  |  |  |
Amount of common stock, preferred stock, depositiry shares, warrants, units or debt securities available in future public offerings |  |  |  |  |  |  |  | $ 150,000,000 |  |  |
Number of shares of common stock called by issuance of warrants | shares |  |  |  |  |  | 4,200,000 |  |  |  | 5,500,000 |
Aggregate exercise price of common stock called by issuance of warrants | $ / shares |  |  |  |  |  |  |  |  |  | $ 2.63 |
Number of shares of common stock called by issuance of warrants, outstanding | shares |  |  |  |  | 0 | 0 |  |  |  |  |
Number of equity compensation plans | item |  |  |  |  | 3 |  |  |  |  |  |
Aggregate intrinsic value outstanding |  |  |  |  | $ 1,700,000 |  |  |  |  |  |
Aggregate intrinsic value exercisable options |  |  |  |  | $ 1,600,000 |  |  |  |  |  |
Stock price | $ / shares |  |  |  |  | $ 2.64 |  |  |  |  |  |
Weighted average remaining contractual life for exercisable |  |  |  |  | 5 years 5 months 5 days |  |  |  |  |  |
Vested and expected to vest, outstanding | shares |  |  |  |  | 22,324,228 |  |  |  |  |  |
Vested and expected to vest, aggregate intrinsic value |  |  |  |  | $ 1,600,000 |  |  |  |  |  |
Vested and expected to vest, weighted average exercise price | $ / shares |  |  |  |  | $ 6.04 |  |  |  |  |  |
Vested and expected to vest, weighted average remaining contractual life |  |  |  |  | 6 years 2 months 23 days |  |  |  |  |  |
Total intrinsic value of options exercised |  |  |  |  | $ 1,700,000 | $ 4,700,000 | $ 3,500,000 |  |  |  |
Fair value of options vested |  |  |  |  | 6,400,000 | 20,700,000 | 7,300,000 |  |  |  |
Stock-based compensation cost capitalized in inventory |  |  |  |  | 441,000 | 389,000 |  |  |  |  |
Stock-based compensation |  |  |  |  | $ 20,352,000 | $ 19,562,000 | $ 13,840,000 |  |  |  |
2010 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock option grant, term |  |  |  |  | 10 years |  |  |  |  |  |
Stock option grant, vest |  |  |  |  | 4 years |  |  |  |  |  |
Stock option grant, vest rate upon first anniversary |  |  |  |  | 25.00% |  |  |  |  |  |
Stock option grant, vest rate per month thereafter |  |  |  |  | 2.08% |  |  |  |  |  |
2010 Director Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock option grant, term |  |  |  |  | 10 years |  |  |  |  |  |
Stock option grant, vest rate upon first anniversary |  |  |  |  | 33.00% |  |  |  |  |  |
Stock option grant, vest rate per month thereafter |  |  |  |  | 2.78% |  |  |  |  |  |
2010 Director Plan [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock option grant, vest |  |  |  |  | 1 year |  |  |  |  |  |
2010 Director Plan [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock option grant, vest |  |  |  |  | 3 years |  |  |  |  |  |
2010 Plan and 2010 Director Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance | shares |  |  |  |  | 6,800,000 |  |  |  |  |  |
ESPP [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock reserved for issuance | shares |  |  |  |  | 1.3 |  |  |  |  |  |
Percentage of outstanding common stock used to determine annual plan increase |  |  |  |  | 2.00% |  |  |  |  |  |
Number of purchase periods | item |  |  |  |  | 4 |  |  |  |  |  |
Purchase period of ESPP |  |  |  |  | 6 months |  |  |  |  |  |
Percentage of fair market value at which stock can be purchased |  |  |  |  | 85.00% |  |  |  |  |  |
Weighted average fair value at grant date | $ / shares |  |  |  |  | $ 2.28 | $ 4.21 | $ 2.20 |  |  |  |
Stock-based compensation |  |  |  |  | $ 3,100,000 | $ 3,700,000 | $ 3,600,000 |  |  |  |
Common stock purchased under plan | shares |  |  |  |  | 1,300,000 | 1,300,000 | 1,100,000 |  |  |  |
Cash received from option exercises |  |  |  |  | $ 5,300,000 | $ 5,200,000 | $ 4,400,000 |  |  |  |
At the Market Offering [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock offering price shares |  |  |  |  |  |  |  |  | $ 60,000,000 |  |
Aggregate offering price of shares sold |  |  |  |  | $ 11,865,000 | $ 58,200,000 | 29,100,000 |  |  |  |
Shares issued | shares |  |  |  |  | 3,200,000 | 6,500,000 |  |  |  |  |
Average common stock price per share | $ / shares |  |  |  |  | $ 3.86 | $ 9.19 |  |  |  |  |
Proceeds from issuance of common stock from offering, net of issuance costs |  |  |  |  | $ 11,865,000 | $ 58,200,000 | 29,100,000 |  |  |  |
Commissions |  |  |  | 3.00% |  |  |  |  |  |  |
At the Market Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price of shares sold |  |  |  |  | $ 3,000 | $ 7,000 | $ 4,000 |  |  |  |
Shares issued | shares |  |  |  |  | 3,171,000 | 6,526,000 | 4,075,000 |  |  |  |
Underwritten Public Equity Offering [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price of shares sold |  |  |  |  | $ 52,530,000 |  |  |  |  |  |
Shares issued | shares |  |  | 17,700,000 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock from offering, net of issuance costs |  |  |  |  | 52,530,000 |  |  |  |  |  |
Commissions |  |  | 4.00% |  |  |  |  |  |  |  |
Price per share | $ / shares |  |  | $ 3.10 | $ 3.10 |  |  |  |  |  |  |
Underwritten Public Equity Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price of shares sold |  |  |  |  | $ 18,000 |  |  |  |  |  |
Shares issued | shares |  |  |  |  | 17,732,000 |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life |  |  |  |  | 2 years 6 months |  |  |  |  |  |
Weighted average fair value at grant date | $ / shares |  |  |  |  | $ 3.08 | $ 5.47 | $ 4.75 |  |  |  |
Stock-based compensation |  |  |  |  | $ 17,200,000 | $ 15,700,000 | $ 10,200,000 |  |  |  |
Unrecognized compensation costs |  |  |  |  | 22,500,000 |  |  |  |  |  |
Cash received from option exercises |  |  |  |  | $ 3,600,000 | $ 2,500,000 | $ 3,000,000 |  |  |  |
Subsequent Event [Member] | 2010 Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional common stock reserved for issuance | shares |  | 7,000,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | ESPP [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Additional common stock reserved for issuance | shares |  | 2,300,000 |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | Underwriting Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares | 14,375,000 |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock from offering, net of issuance costs | $ 32,800,000 |  |  |  |  |  |  |  |  |  |
Commissions | 4.00% |  |  |  |  |  |  |  |  |  |
Price per share | $ / shares | $ 2.40 |  |  |  |  |  |  |  |  |  |
Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders' Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Holders may elect to receive net proceeds from financing activities, percentage |  |  |  |  | 25.00% |  |  |  |  |  |
Holders may elect to receive net proceeds from financing activities as partial payment of notes |  |  |  |  | 25.00% |  |  |  |  |  |

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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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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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