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Subsequent Event (Details)	Oct. 29, 2017 USD ($) shares	Sep. 30, 2017 shares	Dec. 31, 2016 shares
Subsequent Event
Common stock, shares authorized | shares		20,000,000	20,000,000
Subsequent Event | Merger Agreement
Subsequent Event
Conversion ratio	0.875
Number of fractional shares | shares	0
Common stock, shares authorized | shares	32,000,000
Termination fee	$ 25,000,000
Subsequent Event | Merger Agreement | Maximum
Subsequent Event
Reimbursement of termination fee	8,000,000
Capella | Subsequent Event | Merger Agreement
Subsequent Event
Termination fee	25,000,000
Capella | Subsequent Event | Merger Agreement | Maximum
Subsequent Event
Reimbursement of termination fee	$ 8,000,000

X

- Definition

Number of fractional shares of equity interests issued or issuable to acquire entity.

+ References

No definition available.

+ Details

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- Definition

Represents the conversion ratio of number of shares exchanged in business combination.

+ References

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+ Details

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- Definition

Represents the amount of proposed reimbursement termination fee in business combination

+ References

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+ Details

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- Definition

Represents the amount of proposed termination fee in business combination.

+ References

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+ Details

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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