Name:	dtgi_FairValueAssumptionExpectedTerm
Namespace Prefix:	dtgi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Expected stock price volatility.

No definition available.

Name:	dtgi_FairValueAssumptionExpectedVolatilityRate
Namespace Prefix:	dtgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Risk-free interest rate assumption used in valuing an instrument.

No definition available.

Name:	dtgi_FairValueAssumptionRiskFreeInterestRate
Namespace Prefix:	dtgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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.

No definition available.

Name:	us-gaap_EmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901