Short-term and Long-term Debt Obligations - Bank of America (Details)		1 Months Ended	9 Months Ended	12 Months Ended
	May 10, 2017 USD ($)	Jun. 30, 2015 USD ($) building	Mar. 31, 2017 USD ($)	Jun. 30, 2016 USD ($) building	Dec. 31, 2016 USD ($)
Short-term and Long-term Debt [Line Items]
Debt, total outstanding borrowings			$ 145,837,000	$ 93,589,000
Line of Credit | Revolving Credit Facility
Short-term and Long-term Debt [Line Items]
Debt, total outstanding borrowings			$ 83,499,000	$ 72,299,000
Bank of America | Bank of America 2015 Credit Agreement | Minimum
Short-term and Long-term Debt [Line Items]
Interest rate (as a percent)				1.02%
Bank of America | Bank of America 2015 Credit Agreement | Maximum
Short-term and Long-term Debt [Line Items]
Interest rate (as a percent)				1.96%
Bank of America | Bank of America 2015 Credit Agreement | Line of Credit | Revolving Credit Facility
Short-term and Long-term Debt [Line Items]
Debt, total outstanding borrowings				$ 62,199,000
Bank of America | Bank of America 2015 Credit Agreement | Term Loan | Secured Debt
Short-term and Long-term Debt [Line Items]
Credit facility, term		5 years
Term loan, face amount		$ 14,000,000
Number of buildings as collateral | building		3
Debt, total outstanding borrowings				$ 933,000
Bank of America | Bank of America 2015 Credit Agreement | Term Loan | Secured Debt | LIBOR
Short-term and Long-term Debt [Line Items]
Credit facility, basis spread on variable rate (as a percent)		1.50%
Bank of America | Bank of America 2015 Credit Agreement | Line of Credit | Revolving Credit Facility
Short-term and Long-term Debt [Line Items]
Credit facility, maximum borrowing capacity		$ 65,000,000
Bank of America | Bank of America 2016 Credit Agreement | Minimum
Short-term and Long-term Debt [Line Items]
Interest rate (as a percent)			1.37%
Bank of America | Bank of America 2016 Credit Agreement | Maximum
Short-term and Long-term Debt [Line Items]
Interest rate (as a percent)			2.16%
Bank of America | Bank of America 2016 Credit Agreement | Line of Credit | Revolving Credit Facility
Short-term and Long-term Debt [Line Items]
Debt, total outstanding borrowings			$ 63,199,000
Bank of America | Bank of America 2016 Credit Agreement | Term Loan | Secured Debt
Short-term and Long-term Debt [Line Items]
Credit facility, term				5 years
Term loan, face amount				$ 50,000,000
Number of buildings as collateral | building				7
Debt, total outstanding borrowings			42,500,000
Bank of America | Bank of America 2016 Credit Agreement | Term Loan | Secured Debt | LIBOR
Short-term and Long-term Debt [Line Items]
Credit facility, basis spread on variable rate (as a percent)				1.25%
Bank of America | Bank of America 2016 Credit Agreement | Line of Credit | Revolving Credit Facility
Short-term and Long-term Debt [Line Items]
Credit facility, maximum borrowing capacity				$ 55,000,000
Credit facility, remaining borrowing capacity			$ 1,801,000
Bank of America | Bank of America 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | Super Micro Computer, Taiwan and B.V.
Short-term and Long-term Debt [Line Items]
Credit facility, maximum borrowing capacity				$ 10,000,000
Credit facility, basis spread on variable rate (as a percent)				0.90%
Bank of America | Bank of America 2016 Credit Agreement | Line of Credit | Revolving Credit Facility | LIBOR
Short-term and Long-term Debt [Line Items]
Credit facility, basis spread on variable rate (as a percent)			1.25%
LIBOR rate (as a percent)			0.78%
Bank of America | Bank of America 2016 Credit Agreement | Line of Credit | Letter of Credit
Short-term and Long-term Debt [Line Items]
Credit facility, maximum borrowing capacity				$ 5,000,000
Interest rate, stated percentage			1.25%
Bank of America | Bank of America 2016 Amended Credit Agreement | Line of Credit | Revolving Credit Facility
Short-term and Long-term Debt [Line Items]
Credit facility, maximum borrowing capacity					$ 45,000,000
Bank of America | Bank of America 2016 Amended Credit Agreement | Line of Credit | Revolving Credit Facility | Super Micro Computer, Taiwan and B.V.
Short-term and Long-term Debt [Line Items]
Credit facility, maximum borrowing capacity					$ 20,000,000
Subsequent Event | Bank of America | Bank of America 2017 Amended Credit Agreement | Line of Credit | Revolving Credit Facility
Short-term and Long-term Debt [Line Items]
Credit facility, maximum borrowing capacity	$ 85,000,000
Interest rate, stated percentage	2.24%
Proceeds from lines of credit	$ 20,000,000