Debt	9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]
Debt	Debt Lines of Credit Effective in the third quarter of 2018, the Company amended its $25.0 million revolving line of credit agreement to extend the maturity date through December 31, 2018. No amounts were outstanding under this credit agreement as of September 30, 2018 or December 31, 2017. The Company intends to amend or extend this agreement under comparable or more favorable terms, prior to expiration. Certain of the Company’s operating lease agreements entered into prior to September 30, 2018 require security deposits in the form of cash or an unconditional, irrevocable letter of credit. As of September 30, 2018, the Company has entered into standby letters of credit totaling $15.0 million as security deposits for the applicable leased facilities and in connection with government grants. These letters of credit reduced the aggregate amount the Company may borrow under its revolving line of credit to $10.0 million. The Company’s $1.9 million revolving debt facilities related to the Short Course Segment expired on March 31, 2018 and were not renewed. Government Grants The Company has a total of two outstanding conditional loan agreements with Prince George’s County, Maryland and the State of Maryland for an aggregate amount of $3.5 million, each bearing an interest rate of 3% per annum. These agreements are conditional loan obligations that may be forgiven provided that the Company attains certain conditions related to employment levels at our Lanham, Maryland headquarters. The conditional loan with the State of Maryland has a maturity date of December 31, 2026, and the conditional loan with Prince George’s County, Maryland has a maturity date of June 22, 2027. The interest expense related to these loans for the three and nine months ended September 30, 2018 and 2017 is immaterial.

Debt

Lines of Credit

Effective in the third quarter of 2018, the Company amended its $25.0 million revolving line of credit agreement to extend the maturity date through December 31, 2018. No amounts were outstanding under this credit agreement as of September 30, 2018 or December 31, 2017. The Company intends to amend or extend this agreement under comparable or more favorable terms, prior to expiration.

Certain of the Company’s operating lease agreements entered into prior to September 30, 2018 require security deposits in the form of cash or an unconditional, irrevocable letter of credit. As of September 30, 2018, the Company has entered into standby letters of credit totaling $15.0 million as security deposits for the applicable leased facilities and in connection with government grants. These letters of credit reduced the aggregate amount the Company may borrow under its revolving line of credit to $10.0 million.

The Company’s $1.9 million revolving debt facilities related to the Short Course Segment expired on March 31, 2018 and were not renewed.

Government Grants

The Company has a total of two outstanding conditional loan agreements with Prince George’s County, Maryland and the State of Maryland for an aggregate amount of $3.5 million, each bearing an interest rate of 3% per annum. These agreements are conditional loan obligations that may be forgiven provided that the Company attains certain conditions related to employment levels at our Lanham, Maryland headquarters. The conditional loan with the State of Maryland has a maturity date of December 31, 2026, and the conditional loan with Prince George’s County, Maryland has a maturity date of June 22, 2027. The interest expense related to these loans for the three and nine months ended September 30, 2018 and 2017 is immaterial.