Common Stock, Percentage of Voting Rights Pledged as Collateral

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- Definition

Debt Instrument, Convertible Debt, Ownership Cap for Holder

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Debt Instrument, Convertible, Default Terms, Percentage of Ownership

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- Definition

Debt Instrument, Maximum Increase to Initial Conversion Rate

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Debt Instrument, Reimbursable Transaction Fees, Fee Amount

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- Definition

Initial Conversion, Premium Over Closing Price

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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- Definition

Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Amount of the fee that accompanies borrowing money under the debt instrument.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Amount, after accumulated amortization, of debt discount.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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Convertible Notes - Narrative (Details)		1 Months Ended	12 Months Ended
Convertible Notes - Narrative (Details)	Mar. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) d $ / shares shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Principal amount of debt issued			$ 125,000,000
Maturity period for 2014 convertible notes			7 years
Convertible debt
Debt Instrument [Line Items]
Principal amount of debt issued			$ 125,000,000
Legal fees	$ 1,300,000
Initial conversion rate (in percentage)			0.04032
Maximum increase to initial conversion rate (in shares) \| shares			0.01207
Unamortized debt discounts			$ 1,500,000
Convertible debt \| 2014 Notes
Debt Instrument [Line Items]
Convertible notes, interest rate (in percentage)			1.75%
Debt instrument, convertible, stock price trigger (in dollars per share) \| $ / shares			$ 30
Debt instrument, convertible, threshold trading days \| d			30
Transaction fee for debt issuance	625,000	$ 625,000
Debt instrument, fee amount	$ 250,000	$ 250,000
Ownership cap for holder and affiliates (in percentage)			9.985%
Conversion price of notes (in dollars per share) \| $ / shares			$ 24.80
Initial conversion, premium over closing price (in percentage)			30.00%
Default provisions, qualifying percentage of ownership (more than)			50.00%
Interest expense related to 2014 convertible note			$ 2,200,000	$ 2,200,000	$ 551,000
Convertible debt \| 2014 Notes
Debt Instrument [Line Items]
Ownership cap for holder and affiliates (in percentage)			9.985%
Subsidiaries \| Convertible debt
Debt Instrument [Line Items]
Percentage of voting rights pledged as collateral		65.00%