Aggregate number of common shares reserved for future issuance.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

Number of shares issued for each share of convertible preferred stock that is converted.

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Section 50
-Paragraph 2
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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.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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-Publisher FASB
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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.

+ References

No definition available.

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- References

No definition available.

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Stockholders' equity (Details)	1 Months Ended	12 Months Ended
Stockholders' equity (Details)	Oct. 31, 2018	Dec. 31, 2018 shares	Dec. 31, 2017 shares
Stockholders' equity
Common stock authorized (in shares)		100,000,000	100,000,000
Shares of Common Stock reserved
Total (in shares)		6,402,000	8,470,000
Convertible Notes
Shares of Common Stock reserved
Conversion ratio	0.0236323	0.0236323
Convertible Notes \| If Convertible Notes were converted
Shares of Common Stock reserved
Shares issued upon conversion of convertible shares		4,756,000
2001 Plan
Shares of Common Stock reserved
Outstanding stock options (in shares)		14,000	155,000
2011 Plan
Shares of Common Stock reserved
Outstanding stock options (in shares)		290,000	1,128,000
Outstanding RSUs (in shares)		3,119,000	3,324,000
Number of shares available for grant (in shares)		2,979,000	3,863,000